Commit 53027cdf authored by Heiko Stübner's avatar Heiko Stübner Committed by Florian Tobias Schandinat
Browse files

video: auo_k190x: add driver for AUO-K1901 variant 



This controller not only supports higher resolutions than the K1900
but concurrent updates as well. This results in a generally higher
display speed.

Signed-off-by: default avatarHeiko Stübner <heiko@sntech.de>
Signed-off-by: default avatarFlorian Tobias Schandinat <FlorianSchandinat@gmx.de>
parent 96b1d500

drivers/video/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -2407,6 +2407,14 @@ config FB_AUO_K1900 
	  This controller can drive Sipix epaper displays but can only do

	  serial updates, reducing the number of possible frames per second.



config FB_AUO_K1901

	tristate "AUO-K1901 EPD controller support"

	depends on FB && FB_AUO_K190X

	help

	  This driver implements support for the AUO K1901 epd-controller.

	  This controller can drive Sipix epaper displays and supports

	  concurrent updates, making higher frames per second possible.



config FB_JZ4740

	tristate "JZ4740 LCD framebuffer support"

	depends on FB && MACH_JZ4740

drivers/video/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -120,6 +120,7 @@ obj-$(CONFIG_FB_METRONOME) += metronomefb.o 
obj-$(CONFIG_FB_BROADSHEET)       += broadsheetfb.o

obj-$(CONFIG_FB_AUO_K190X)	  += auo_k190x.o

obj-$(CONFIG_FB_AUO_K1900)	  += auo_k1900fb.o

obj-$(CONFIG_FB_AUO_K1901)	  += auo_k1901fb.o

obj-$(CONFIG_FB_S1D13XXX)	  += s1d13xxxfb.o

obj-$(CONFIG_FB_SH7760)		  += sh7760fb.o

obj-$(CONFIG_FB_IMX)              += imxfb.o

drivers/video/auo_k1901fb.c

0 → 100644
+251 −0
Original line number Diff line number Diff line 
/*

 * auok190xfb.c -- FB driver for AUO-K1901 controllers

 *

 * Copyright (C) 2011, 2012 Heiko Stuebner <heiko@sntech.de>

 *

 * based on broadsheetfb.c

 *

 * Copyright (C) 2008, Jaya Kumar

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 *

 * Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven.

 *

 * This driver is written to be used with the AUO-K1901 display controller.

 *

 * It is intended to be architecture independent. A board specific driver

 * must be used to perform all the physical IO interactions.

 *

 * The controller supports different update modes:

 * mode0+1 16 step gray (4bit)

 * mode2+3 4 step gray (2bit)

 * mode4+5 2 step gray (1bit)

 * - mode4 is described as "without LUT"

 * mode7 automatic selection of update mode

 *

 * The most interesting difference to the K1900 is the ability to do screen

 * updates in an asynchronous fashion. Where the K1900 needs to wait for the

 * current update to complete, the K1901 can process later updates already.

 */



#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/errno.h>

#include <linux/string.h>

#include <linux/mm.h>

#include <linux/slab.h>

#include <linux/delay.h>

#include <linux/interrupt.h>

#include <linux/fb.h>

#include <linux/init.h>

#include <linux/platform_device.h>

#include <linux/list.h>

#include <linux/firmware.h>

#include <linux/gpio.h>

#include <linux/pm_runtime.h>



#include <video/auo_k190xfb.h>



#include "auo_k190x.h"



/*

 * AUO-K1901 specific commands

 */



#define AUOK1901_CMD_LUT_INTERFACE	0x0005

#define AUOK1901_CMD_DMA_START		0x1001

#define AUOK1901_CMD_CURSOR_START	0x1007

#define AUOK1901_CMD_CURSOR_STOP	AUOK190X_CMD_DATA_STOP

#define AUOK1901_CMD_DDMA_START		0x1009



#define AUOK1901_INIT_GATE_PULSE_LOW	(0 << 14)

#define AUOK1901_INIT_GATE_PULSE_HIGH	(1 << 14)

#define AUOK1901_INIT_SINGLE_GATE	(0 << 13)

#define AUOK1901_INIT_DOUBLE_GATE	(1 << 13)



/* Bits to pixels

 *   Mode	15-12	11-8	7-4	3-0

 *   format2	2	T	1	T

 *   format3	1	T	2	T

 *   format4	T	2	T	1

 *   format5	T	1	T	2

 *

 *   halftone modes:

 *   format6	2	2	1	1

 *   format7	1	1	2	2

 */

#define AUOK1901_INIT_FORMAT2		(1 << 7)

#define AUOK1901_INIT_FORMAT3		((1 << 7) | (1 << 6))

#define AUOK1901_INIT_FORMAT4		(1 << 8)

#define AUOK1901_INIT_FORMAT5		((1 << 8) | (1 << 6))

#define AUOK1901_INIT_FORMAT6		((1 << 8) | (1 << 7))

#define AUOK1901_INIT_FORMAT7		((1 << 8) | (1 << 7) | (1 << 6))



/* res[4] to bit 10

 * res[3-0] to bits 5-2

 */

#define AUOK1901_INIT_RESOLUTION(_res)	(((_res & (1 << 4)) << 6) \

					 | ((_res & 0xf) << 2))



/*

 * portrait / landscape orientation in AUOK1901_CMD_DMA_START

 */

#define AUOK1901_DMA_ROTATE90(_rot)		((_rot & 1) << 13)



/*

 * equivalent to 1 << 11, needs the ~ to have same rotation like K1900

 */

#define AUOK1901_DDMA_ROTATE180(_rot)		((~_rot & 2) << 10)



static void auok1901_init(struct auok190xfb_par *par)

{

	struct auok190x_board *board = par->board;

	u16 init_param = 0;



	init_param |= AUOK190X_INIT_INVERSE_WHITE;

	init_param |= AUOK190X_INIT_FORMAT0;

	init_param |= AUOK1901_INIT_RESOLUTION(par->resolution);

	init_param |= AUOK190X_INIT_SHIFT_LEFT;



	auok190x_send_cmdargs(par, AUOK190X_CMD_INIT, 1, &init_param);



	/* let the controller finish */

	board->wait_for_rdy(par);

}



static void auok1901_update_region(struct auok190xfb_par *par, int mode,

						u16 y1, u16 y2)

{

	struct device *dev = par->info->device;

	unsigned char *buf = (unsigned char *)par->info->screen_base;

	int xres = par->info->var.xres;

	u16 args[5];



	pm_runtime_get_sync(dev);



	mutex_lock(&(par->io_lock));



	/* y1 and y2 must be a multiple of 2 so drop the lowest bit */

	y1 &= 0xfffe;

	y2 &= 0xfffe;



	dev_dbg(dev, "update (x,y,w,h,mode)=(%d,%d,%d,%d,%d)\n",

		1, y1+1, xres, y2-y1, mode);



	/* K1901: first transfer the region data */

	args[0] = AUOK1901_DMA_ROTATE90(par->rotation) | 1;

	args[1] = y1 + 1;

	args[2] = xres;

	args[3] = y2 - y1;

	buf += y1 * xres;

	auok190x_send_cmdargs_pixels_nowait(par, AUOK1901_CMD_DMA_START, 4,

					    args, ((y2 - y1) * xres)/2,

					    (u16 *) buf);

	auok190x_send_command_nowait(par, AUOK190X_CMD_DATA_STOP);



	/* K1901: second tell the controller to update the region with mode */

	args[0] = mode | AUOK1901_DDMA_ROTATE180(par->rotation);

	args[1] = 1;

	args[2] = y1 + 1;

	args[3] = xres;

	args[4] = y2 - y1;

	auok190x_send_cmdargs_nowait(par, AUOK1901_CMD_DDMA_START, 5, args);



	par->update_cnt++;



	mutex_unlock(&(par->io_lock));



	pm_runtime_mark_last_busy(dev);

	pm_runtime_put_autosuspend(dev);

}



static void auok1901fb_dpy_update_pages(struct auok190xfb_par *par,

						u16 y1, u16 y2)

{

	int mode;



	if (par->update_mode < 0) {

		mode = AUOK190X_UPDATE_MODE(1);

		par->last_mode = -1;

	} else {

		mode = AUOK190X_UPDATE_MODE(par->update_mode);

		par->last_mode = par->update_mode;

	}



	if (par->flash)

		mode |= AUOK190X_UPDATE_NONFLASH;



	auok1901_update_region(par, mode, y1, y2);

}



static void auok1901fb_dpy_update(struct auok190xfb_par *par)

{

	int mode;



	/* When doing full updates, wait for the controller to be ready

	 * This will hopefully catch some hangs of the K1901

	 */

	par->board->wait_for_rdy(par);



	if (par->update_mode < 0) {

		mode = AUOK190X_UPDATE_MODE(0);

		par->last_mode = -1;

	} else {

		mode = AUOK190X_UPDATE_MODE(par->update_mode);

		par->last_mode = par->update_mode;

	}



	if (par->flash)

		mode |= AUOK190X_UPDATE_NONFLASH;



	auok1901_update_region(par, mode, 0, par->info->var.yres);

	par->update_cnt = 0;

}



static bool auok1901fb_need_refresh(struct auok190xfb_par *par)

{

	return (par->update_cnt > 10);

}



static int __devinit auok1901fb_probe(struct platform_device *pdev)

{

	struct auok190x_init_data init;

	struct auok190x_board *board;



	/* pick up board specific routines */

	board = pdev->dev.platform_data;

	if (!board)

		return -EINVAL;



	/* fill temporary init struct for common init */

	init.id = "auo_k1901fb";

	init.board = board;

	init.update_partial = auok1901fb_dpy_update_pages;

	init.update_all = auok1901fb_dpy_update;

	init.need_refresh = auok1901fb_need_refresh;

	init.init = auok1901_init;



	return auok190x_common_probe(pdev, &init);

}



static int __devexit auok1901fb_remove(struct platform_device *pdev)

{

	return auok190x_common_remove(pdev);

}



static struct platform_driver auok1901fb_driver = {

	.probe	= auok1901fb_probe,

	.remove = __devexit_p(auok1901fb_remove),

	.driver	= {

		.owner	= THIS_MODULE,

		.name	= "auo_k1901fb",

		.pm = &auok190x_pm,

	},

};

module_platform_driver(auok1901fb_driver);



MODULE_DESCRIPTION("framebuffer driver for the AUO-K1901 EPD controller");

MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");

MODULE_LICENSE("GPL");

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